October 29, 2015
On Thursday, October 29, 2015, the President signed into law:
H.R. 3819, the "Surface Transportation Extension Act of 2015," which (1) extends through November 20, 2015, authority and funding for the Department of Transportation's surface transportation programs; and (2) extends the deadline for compliance with positive train control system implementation by three years, to December 31, 2018.
Barack Obama, Statement by the Press Secretary on H.R. 3819 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/319139